You might also look at autolog
(http://www.rpmfind.net/linux/RPM/autolog.html)
which can also automatically log out shell
sessions after inactivity. The only RPMs I
found on this were for S.u.S.E.
--- so You might
have to grab an SRC RPM and rebuild it.
(Red Hat doesn't list dependencies and provisions
using the same keys as S.u.S.E).